Submitted to: Air and Waste Management Annual Conference Proceedings
Publication Type: Proceedings
Publication Acceptance Date: 2/9/2018
Publication Date: 9/21/2018
Citation: Silva, P.J. 2018. Sampling agriculture air quality influences in Northern Utah during a wintertime inversion. Air and Waste Management Annual Conference Proceedings. Paper No. 410945.
Technical Abstract: Several of Utah’s valleys are classified as non-attainment for fine particulate matter. Past data indicate that ammonium nitrate is the major contributor to fine particles and that the gas phase ammonia concentrations are among the highest in the United States. During the 2017 Utah Winter Fine Particulate Study, we used several instruments to monitor gaseous concentrations of agriculture-related compounds in the Cache Valley including ammonia and volatile organic compounds, particulate matter size distributions using a scanning mobility particle sizer and aerodynamic particle sizer. We also measured hourly concentrations for gas and particulate ions using an ambient ion monitor. High ammonia concentrations were detected during the study with concentrations at the site above 100 ppb at times, indicating a significant influence from agriculture at the sampling site. Ammonia was not the only agricultural emission elevated in Cache Valley during winter, as reduced sulfur gas concentrations of up to ~20 ppb were also detected. Dimethylsulfide was the major sulfur-containing gaseous species. Analysis indicates that particle growth events were observed by the SMPS. Relationships between gas concentrations and meteorology will be presented. In addition, correlations gas concentrations and aerosol formation potentially influenced by agricultural emissions will be discussed.